I also have the Specialized Ruby with the SRAM Apex group. After I read your last post, I went over to the bike and played with the shifting to test how much strength was needed. The left shifter does take more force to shift than the right, but you should be able to do it IF the bike has been set up correctly. When I brought my bike home from the bike shop, I couldn't shift the front shifter to save my life ...and I have large strong hands! I adjusted the cable tension and properly set the derailleur stop screws. After making these adjustments, I can shift the front derailleur with just my ring finger.

My guess is that the shifter cable tension and, possibly, the derailleur stop screw for the large ring need to be adjusted. Just because 2 shops said it is okay does not necessarily make it so. If you don't know how to adjust these things, take it back to the store where you bought it, and ask to see the manager. If the manager doesn't or can't get it fixed, call Specialized customer support.